<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        function getinfo(member,years){
          member.name="css";
          years="1998";
        }
        var person={name:"html"};
        var birthYear="1997";
        getinfo(person,birthYear);

        console.log(person,birthYear)//{name: "css"} "1997"
    </script>
</body>
</html>